I need to read and write few gpio pins in Bank0, Bank1, Bank2 and Bank3 to enable Ethernet Phy chip from uboot on my custom board. Since there is no GPIO functions implemented in uboot for ti81xx, I tried to use __readl and __writel function to read and write. But code hangs while reading OMAP4_GPIO_OE register. Can some one help me to fix this issue. DO I need to enable clock for GPIOs. Below is my code for your reference. I have added below code in uboot/board/ti/ti811x/evm.c
/********************Console message******************/
Configuring PAD58_CNTRL for E0_RESET_N
Setting pin as: output
Reading register: 48032134
/*************************************************************/
/* GPIO Base address */
#define GPIO0_BASE 0x48032000
#define GPIO1_BASE 0x4804C000
//*******
#define GPIO2_BASE 0x481AC000
#define GPIO3_BASE 0x481AE000
#define OMAP4_GPIO_OE 0x0134
#define OMAP4_GPIO_DATAIN 0x0138
#define OMAP4_GPIO_DATAOUT 0x013c
#define OMAP4_GPIO_CLEARDATAOUT 0x0190
#define OMAP4_GPIO_SETDATAOUT 0x0194
#define INPUT 1
#define OUTPUT 0
#define PHY_RESET_GPIO0_PIN 28
#define PHY_EN_GPIO3_PIN 23
#define PHY_WAKE_GPIO3_PIN 16
static void set_pin_direction(unsigned int bank, unsigned int gpio, unsigned int is_input)
{
printf("Setting pin as: %s\n", ((is_input==INPUT)? "input":"output"));
unsigned int regAddr=bank+OMAP4_GPIO_OE;
unsigned int value = 0;
printf("Reading register: %x\n",regAddr);
value = __raw_readl(regAddr);
if (is_input)
value |= 1 << gpio;
else
value &= ~(1 << gpio);
printf("writing register: %x with %x\n",regAddr, value);
__raw_writel(value, regAddr);
}
static void set_pin_value(unsigned int bank, unsigned int gpio, unsigned int value)
{
printf("Setting pin %d with %d\n", gpio, value);
unsigned int regAddr=bank;
if (value)
regAddr += OMAP4_GPIO_SETDATAOUT;
else
regAddr += OMAP4_GPIO_CLEARDATAOUT;
value = 1 << gpio;
__raw_writel(value, regAddr);
}
called below line in my board_init
val = PAD58_CNTRL; /*GP0[28]E0_RESET_N--OUT*/ //set to 1
PAD58_CNTRL = (volatile unsigned int) (BIT(18) | /*BIT(17) |*/ BIT(7));
set_pin_direction(GPIO0_BASE, PHY_RESET_GPIO0_PIN, OUTPUT);
set_pin_value(GPIO0_BASE, PHY_RESET_GPIO0_PIN, 0);
{
printf("Setting pin as: %s\n", ((is_input==INPUT)? "input":"output"));
unsigned int regAddr=bank+OMAP4_GPIO_OE;
unsigned int value = 0;
printf("Reading register: %x\n",regAddr);
value = __raw_readl(regAddr);
if (is_input)
value |= 1 << gpio;
else
value &= ~(1 << gpio);
printf("writing register: %x with %x\n",regAddr, value);
__raw_writel(value, regAddr);
}
static void set_pin_value(unsigned int bank, unsigned int gpio, unsigned int value)
{
printf("Setting pin %d with %d\n", gpio, value);
unsigned int regAddr=bank;
if (value)
regAddr += OMAP4_GPIO_SETDATAOUT;
else
regAddr += OMAP4_GPIO_CLEARDATAOUT;
value = 1 << gpio;
__raw_writel(value, regAddr);
}
called below line in my board_init
val = PAD58_CNTRL; /*GP0[28]E0_RESET_N--OUT*/ //set to 1
PAD58_CNTRL = (volatile unsigned int) (BIT(18) | /*BIT(17) |*/ BIT(7));
set_pin_direction(GPIO0_BASE, PHY_RESET_GPIO0_PIN, OUTPUT);
set_pin_value(GPIO0_BASE, PHY_RESET_GPIO0_PIN, 0);
